Fox confirmed at today’s Upfronts that the Simpsons/Family Guy crossover episode, “The Simpsons Guy,” will air in September. The Griffins end up in Springfield and pair off with their Simpsons counterparts. Stewie becomes obsessed with Bart. Lisa befriends Meg. Marge and Lois bond. Peter and Homer fight over which beer is better: Pawtucket or Duff.

Family Guy enters season 13 and The Simpsons returns for an amazing 26th season in the fall. Click here for Fox’s full fall schedule, announced today, and hit the jump to check out two images from “The Simpsons Guy.”

Official episode synopsis:

Peter (Seth MacFarlane) and the Griffins get out of dodge and end up in Springfield, where they are greeted by a friendly stranger named Homer Simpson (guest voice Dan Castellaneta), who welcomes his new “albino” friends with open arms. The families get along famously: Stewie (MacFarlane) becomes obsessed with Bart (guest voice Nancy Cartwright) and his old-fashioned pranks; Lisa (guest voice Yeardley Smith) takes Meg (Mila Kunis) under her wing and is determined to find something – anything – at which she excels; Marge (guest voice Julie Kavner) and Lois (Alex Borstein) ditch housework for a little bonding; and Peter and Homer fight over the best beer in town – Pawtucket vs Duff.